java web使其支持跨域请求
当前后台服务分开时，Ajax异步请求不在一个域名下，会报出跨域请求问题。
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. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. |
要使java服务支持跨域请求需在response的header中添加
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"Access-Control-Allow-Origin", "*" |
所以，通过filter方式解决此问题，具体代码与配置如下。
web.xml配置
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<filter> <filter-name>cors</filter-name> <filter-class>com.hanlin.filter.CORSFilter</filter-class> </filter> <filter-mapping> <filter-name>cors</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> |
java filter 代码
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public class CORSFilter implements Filter { public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletResponse response = (HttpServletResponse) res; response.setHeader("Access-Control-Allow-Origin", "*"); response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE"); response.setHeader("Access-Control-Max-Age", "3600"); response.addHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept"); chain.doFilter(req, res); } public void init(FilterConfig filterConfig) { } public void destroy() { } } |
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